--- title: "What Is the Difference Between Social Security Disability Income (SSDI) and Supplemental Security Income (SSI)?" url: https://callsam.com/blog/whats-the-difference-between-ssi-and-ssd/ description: "SSDI is earned from work credits. SSI is needs-based. Both use SSA’s disability rules, but waiting periods, Medicare/Medicaid, and income tests differ." lastModified: 2026-10-11 --- # What Is the Difference Between Social Security Disability Income (SSDI) and Supplemental Security Income (SSI)? Published: June 18, 2014 If you or a family member cannot work because of a disability, the Social Security Administration (SSA) has two main cash programs: **Social Security Disability Insurance (SSDI)** (often called SSD) and **Supplemental Security Income (SSI)**. People mix them up because both use SSA’s medical rules. The money, the paperwork, and who qualifies are not the same. A [Michigan disability lawyer](https://callsam.com/case-types/social-security-disability/) can tell you which program (or both) fits your work history and household. ## WHAT IS SSDI? SSDI is an **earned** insurance benefit. You (and your employers, or you as self-employed) paid Social Security taxes. If you have enough **work credits** and meet the medical definition of disability, you can draw a monthly benefit based on your earnings record. It can also pay certain family members (a spouse, a child, or, in limited cases, a disabled widow or widower) on the worker’s record. An adult disabled before age 22 may get child’s benefits on a parent’s record. That is still SSDI-type coverage, not SSI. SSDI is **not** needs-based. You can own a home and still qualify. You generally cannot earn over SSA’s **substantial gainful activity (SGA)** limit and be found disabled. See [eligibility](https://callsam.com/blog/are-you-eligible-for-social-security-disability-heres-what-you-need-to-know/). ## WHAT IS SSI? SSI is a **federal needs-based** program. It is not funded by your work record. It pays a modest monthly amount to people with limited **income and resources** who are: - Disabled or blind (adults or children), or - Age 65 or older (even without a disability, if the financial rules are met) For an individual, countable resources are generally capped at **$2,000** ($3,000 for a couple). SSA excludes some items (often a home you live in and one vehicle, with rules). Countable income, including some in-kind support, reduces the federal benefit. The federal benefit rate changes each year. Children can get SSI if the medical and financial tests are met. Household income is often “deemed” to the child. See [child SSI](https://callsam.com/blog/child-disability-lawyer-ssi-benefits/). ## HOW IS “DISABILITY” DECIDED? For **adults**, SSDI and SSI use the same basic medical standard: you cannot do substantial work because of a condition expected to last at least 12 months or result in death. SSA looks at listings, residual functional capacity, age, education, and past work. For **children**, SSI uses a different test (marked and severe functional limits). A child does not get SSDI on their own work record unless they have worked enough, which is uncommon. Medical evidence still matters most from [acceptable medical sources](https://www.ssa.gov/disability/professionals/bluebook/evidentiary.htm) (licensed physicians, psychologists, and other sources SSA lists, including many APRNs and physician assistants). Family letters help with function; they do not replace clinical findings. Some diagnoses on the [Compassionate Allowances](https://www.ssa.gov/compassionateallowances/conditions.htm) list move faster when the records are clear. That is not a separate benefit type. ## WAITING PERIODS, MEDICARE, AND MEDICAID - **SSDI** has a five-month waiting period after the established onset date before cash benefits start. **Medicare** generally starts after 24 months of SSDI entitlement (with limited exceptions, such as ALS). - **SSI** has no five-month waiting period. In Michigan, SSI eligibility usually opens the door to **Medicaid**. You can receive **both** (concurrent benefits) if you are insured for SSDI and also poor enough for SSI. SSDI counts as income against SSI. ## WHICH ONE SHOULD I APPLY FOR? Apply for SSDI if you have recent covered work. Apply for SSI if your income and resources are low, especially if you have little work history, you are a disabled child, or you are 65+ with limited means. Many people file for **both** on the same application. SSA will sort insured status. You can [apply online](https://www.ssa.gov/benefits/disability/), by phone (800-772-1213), or at a local office. Deadlines on appeals are short. See [how to apply](https://callsam.com/blog/apply-for-social-security-disability/) and the [appeal process](https://callsam.com/blog/what-does-the-ssa-disability-appeal-process-look-like/). ## CONTACT OUR EXPERIENCED SOCIAL SECURITY DISABILITY LAWYERS Social Security Disability law is complicated, but finding the right [Michigan disability attorney](https://callsam.com/case-types/social-security-disability/) is simple. Fill out the brief form below or contact us for a free, no-obligation consultation. ## Related Posts ### [Social Security Denies Thousands of Disability Claims Based on Obsolete Job Directory](https://callsam.com/blog/social-security-denies-thousands-disability-claims/) ### [How the Recent Stimulus Checks Affect Your SSDI Benefits](https://callsam.com/blog/how-the-recent-stimulus-checks-affect-ssdi-benefits/) ### [The 11 Best Social Security Disability Resources Across the Web For Michiganders](https://callsam.com/blog/social-security-disability-resources-for-michiganders/) ### [Answering Your Questions About Social Security Disability and Taxes](https://callsam.com/blog/questions-about-social-security-disability-taxes/) ### [What Does the SSA Disability Appeal Process Look Like?](https://callsam.com/blog/what-does-the-ssa-disability-appeal-process-look-like/) ### [Are You Eligible for Social Security Disability? Here’s What You Need to Know](https://callsam.com/blog/are-you-eligible-for-social-security-disability-heres-what-you-need-to-know/) ### [How a Veteran (VA) Disability Lawyer Can Help You and Your Family](https://callsam.com/blog/veterans-va-disability-lawyer-can-help-you-and-your-family/) ### [How a Disability Lawyer Can Help Your Child Receive SSI Benefits](https://callsam.com/blog/child-disability-lawyer-ssi-benefits/) ### [Do I Need a Lawyer to Get Disability?](https://callsam.com/blog/disability-lawyer-attorney-necessary/) ### [How Much Does a Disability Lawyer Cost?](https://callsam.com/blog/disability-lawyer-cost-fees/)